Tata Consultancy Services Limited (TCS) (BSE: 532540, NSE: TCS) is an Indian multinational information technology (IT) services, business solutions and outsourcing services company headquartered in Mumbai, Maharashtra. TCS is a subsidiary of the Tata Group and is listed on the Bombay Stock Exchange and the National Stock Exchange of India. It is one of India's most valuable companies and is the largest India-based IT services company by 2012 revenues. Tata Consultancy Services (TCS) was founded in 1968. Its early contracts included providing punched card services to sister company TISCO (now Tata Steel), working on an Inter-Branch Reconciliation System for the Central Bank of India,and providing bureau services to Unit Trust of India.